Slotting-machine.



A. FORSTER.

SLOTTING MACHiNE. APPLICATlON FILED JULY :5. 191a.

Patented Feb. 18, 1919.

a SHEETS-SHEET. 1.

A. FORSTER. SLOTTING MACHINE.

APPLICATION FILED JULY 15. 191B.

Patented Feb. 18, 1919.

3 SHEETSSHEET 2- A. FORSTEH.

SLOTTING MACHlNE.

APPLICATION FILED JULY L5. 1918.

1,294,646. I Patented Feb. 18, 1919.

3 SHEETS-SHEET 31.

' UNITED STATES PATENT orrion ANDREW FORSTER, OF COWES, ISLE OF WIGHT,ENGLAND, ASSIGNOR TO J. SAMUEL WHITE 86 COMPANY, LIMITED, OF EAST COWES,ISLE OF WIGHT, ENGLAND.

SLOTTING-MACHINE.

Application filed July 15, 1918.

To all whom it may concern:

Be it known that 1, ANDREW FORSTER, a subject of the King of England,and residing at Cowes, Isle of Wight, in England, have invented certainnew and useful Improvements in slotting-Machines, of which the followingis a specification.

This invention relates to slotting machines and has for its object toprovide a machine which is more especially adapted for operating on asemi cylindrical or otherwise curved object wherein the slotting is tobe performed in conformity with the curvature of the object and toenable undercut or inclined surfaces to be dealt with.

In the construction of parts of some mechanisms such for example as thecasings of certain types of steam turbines it is necessary to slot outports in the end portion of a semi-cylindrical member and these portshave to be cut on the curve and are usually undercut. This slottingoperation has hitherto been carried out by hand and is commonly not easyto perform with the necessary accuracy and finish especially where asmay be the case the ports are positioned near the main wall of thecasing. By means of the present invention the slotting can be effectedaccurately and expeditiously while the tool can be inclined to avariable extent in order to adjust the angle of undercut as desired tomeet requirements.

According to this invention a reciprocating tool box is pivotallysuspended so that the direction of the tool stroke can be varied andthis tool box carries a member so formed that a block which lies in aguide therein can both reciprocate and also oscillate about alongitudinal axis. A power driven shaft is provided having a crank pinwhich engages and can slide freely in the sliding block at right anglesto the direction in which the block slides in its guide and by means ofthis shaft and crank pin the tool holder is reciprocated irrespective ofthe angular adjustment of the tool box. The guide carried by the toolholder is wholly or partially cylindrical and preferably formed in thebody of the holder the block which lies in this guide being of suitabledimensions and so constructed as to permit of its oscillation about theaxis of the guide as well asreciprocating therein. The axis of the powerdriven crank shaft Specification of Letters Patent.

Patented Feb. 18, 1919.

Serial No. 244,928.

lies at right angles to the axis of the cylindrical guide and the crankpin which is preferably carried on a disk or otherwise formed or mountedon the end of the power shaft passes through openings in the side of thetool box and in the tool holder and engages the block in the guide insuch a manner that this block can slide freely on the crank pin. Thetool box is suspended from a member pivotally carried on a frame whichis so constructed and arranged that it can bemounted on or fixed to thework when the member which carries the tool box can be swung withrelation to the work about its pivot center. The power driven shaft isdisposed radially with relation to this pivot. center so that the toolcan be swung into any position about this center and slotting performedthereby on an arc of a circle of which the pivot on the frame is thecenter. At the same time by adjusting the tool box about its point ofsuspension the direction of the tool stroke can be varied so thatundercutting can be performed. In addition to movement about its pivotcenter the memher which carries the tool box and the power shaft can beadjusted radially with respect to this center both for the purpose offeeding the tool to its work in the radial direction and also to enablethe tool to be operative on parts whose radius of curvature isdifferent. The screw adjustment is conveniently provided for purposes offeed and radial adjustment of the tool within certain limits. Forgreater variations in the operative radius of the tool the power shaftcan be changed for one of greater or less length the member carrying theshaft of the tool box being'so formed that its radial length can bevaried to a corresponding extent.

Power is preferably obtained from an electric motor mounted on themember which carries the shaft and tool box the motor being connected bysuitable gearing to the shaft. Alternatively power may be conveyed tothe shaft through a flexible shaft, or a compressed air motor may beemployed.

The frame which carries the whole machine is conveniently of girder typeand of such construction and dimensions as to permit of its beingattached to the work on which the slotting operation is to be performedby bolting the frame through this work or otherwise mounting the machinein fixed relation to the work.

IOU

The accompanying drawings illustrate by vided with a cranklfin I I.Onthe opposite way of exampleone construction of the lIXI end of theshaft which pr]ects,bey0nd proved slotting machine showing it as bethergart C is mounted a gear Wheel ing employed on a portion of thecasing of e' tool box J is provided at ts upper a steam turbine. Inthese drawings, pantvwithitwo lugs J and a pin K is passed 70 Figure 1is a plan of the slotting machine through these lugs and through the lugI) showing it bolted in position on the .Work, so that the tool box isthereby pivotally susthe driving motor being omitted. pended from thepart D. Within the tool Fig. 2 is a central vertical seetiou throngh boxis mounted a member which forms part the machine taken on the line 22 ofFig. 1 of 01' to which is fixed the tool holder M. 75

the drivingmotor being here shown in place. The member L canmoye'vertieally in the Fig. is an'end elevation ofthemachine tool boar-Jso as to impart the necessary reviewed fronithe right hand side'of Fignlciproeatingmovement to the tool-M"; The" theelect-rioinotorbeingomittedi interion of the memberL 'is hollowed out Fig. 1 is anelevation of the tool- -box end "toeonstit-ute a cylindrical guide L theaxis80 V of the machine the motor being;omitted. of-which lies in01=2\l)0l1t3 th8 same plane Fig-:5 is a seetion'of the tool box takenbut at right anglesto the rtionsiofthetoolw on the line 5'-5 of Fig. andlooking in the box J whiehserve to gut the member Lin dire'otion ofthe-arrows. its reeiproeatingmovementoi Inthiswcylin 20. LikeJettersindicate"iilce pavte througha' drical-guide L lies a block- N shaped sothat 85- outthe drawingsa' itcan botlvreciproeate in the guide 'L" and Aframeinember Aof'suitable *length and also oscillate therein about theaxis of this construction carries in the cerrter of its cylindricalguidex" An opening -L iis formed lengtha bedplate -B=providedon itsunderin'the rear sideof the guide member L and i f side with a ivet pinB whichlies in a oorthrough this openingpasses theierank pimH? 90responding iiole A" in thecframe A The'bed-= \vhich so engages thesliding block N that plate =B carriesonits underside emit thethe'cranlo-pin ran-slideifreeiy in and out of pivot pin*B" a w0rmwheel Bwith whiehmthe bleck -N. Thus asthe sheft Ii -rotates: gears aworm Asuitably fixedmmthe framwthe erank pin will cause the block N to Aandprovided with'some eonvenient memsi reciproeate in the guide "L?!while the guide r9 forrotatingit. :ByEmeanmof thiswoz-meA member L willbe caused toreciproeate in andthe wheel-B -tl1e betii iplate B cannbethe toolbo x J therebyiimpartingithet neces swung into any-positionabout w its ivot B sarymovement to thertoot'Me 'ingtotlle on the frameA. The upper part o the bedfaat that the: blockuN can. oscillate in the-plate'B formed as a slide 'B on which guide L and the crank pin: H iisfree to-IOOY restsameinberor casing:so-as-to'be rnovable slide in theblock! N ,-reciproeation cam-be onthe -slideiin a radia'l direetioo withrela imparted to the-bloek--N andoto theaguidei' tion tothe pivot BLThis membeni s formed membeviL respeetiwely' by the crank ipin of twoparts 0 and D suitabty connectedtem H irre active, withinneaaonahlerlimzits, of v 40 gether byhbolts' or otherwise. The part Cthwang ii iab positioniof theztoollbox'fl aboutiilll ormsthe mainportion of-ithe'memberand fits-pivot Km Thus without-ialteration orafcom-prises a -downwardly directed ortion fecting the opemtionmof themachine' the C whichrests -omand-eng the'e ide B i position of thetool-boxJ can be adjustad' a niaiin body portion and an uppe!'-'plate Cabout the pivot K sons to vanx otheidimotion on whiohhs mounted-aneleetnic motor- E." of theitoolistmke- This. angulari adjustment Thepart -I) isbolted-to one endof the -papt is eonvenientlyieflected bymeans of arms C and comprises a downward)? directed or pins-1 0'whiehare ear-nied by and project portion-D"shaped to engage-the elide Bfrommtheu hack ofathe-dootbox J. These and a lug D onits upper partwhich over-- arms) ale clamped-or fixed by screws in 50 hangs the end ofthe art- D.*- A feed+ s )11ie suitablemention*toolateral lugs D screw Fis carried at its ends Fby theipavts fUWlNPd*OI1 the part RD CandD.andthisscrewpassesthroughand Power is transmitted-from theieleetric engages 1a correspondingly-screw-threadedmotor E.tothelshafttH'bysuitahhagearimgq block G inounteahon the end of a;spindlwG which. may .eomprise asuin theioonstruetiom- 55' whiehpaeseeidownwardly through the pivotilillustratedia pinion E omthe motorshaft P B; Onemends'F" of the screw- F is which geamwitha toothedwheel-1? mounted. squared tp permitof eheiscmw beingqmied on one endof alay shmftPiion the other end: in some 'eonvenient-manner for the pur oseof whieh is a pinion P which germs with i of movingthe memberor easing CD in 1. thewoothed wheel H 1 imoqpted on the end A 60' radialdirectionuwithk-elation to the pivotal f theishmtb H. 12

B; The member C D is formed hollow The machine. is shuwnoin thedrawingsras about its' center portion and has its ends being arrangedto=s1otout ports Q formed COIlStI'UCtBdfiS bearings which carry a poweri1rtl1e=iend portion Q" of one half of a tlll'rshaft On that end ofthe-shaft which bine casing Q; .Whem lacedi in position the 651'projectsbeyond the pam'Dwis a dislnlllflpro flf w 1 A is fl nges Q- of theturbine casing when the pivot B will lie with its axis coincident withthe axis of the casing. The position of the tool is then radiallyadjusted by means of the feed screw F and by means of the arms 0 and theangle of inclination of the tool box J is set in accordance with thedirection in which the tool strokes are to be taken in order to undercut the ports Q in the desired manner as shown in Fig. By means ofthe worm A and wheel B the machine can be swung shaft H and screw Fremoved. Another and into position so as to operate in succession oneach of the ports Q and by means of the worm A the tool is fed to itswork in a circumferential direction about the pivot B. The feed for thedepth of cut is effected by the screw F. It will be seen that with thismachine the slotting of all the ports Q can be effected truly on arcsstruck from the axial center of the casing and accuracy in thedimensions of the ports and similar undercuting in each port can beinsured. It is obvious that the tool may be set to slot out either sideof each port and by suitable angular adjustment of the tool box the twoopposite walls of the port or passage Q can be undercut the strokesbeing inclined in opposite directions.

.The details of construction may be varied to meet requirements and thenature of the work on which the machine is intended to operate. If it isdesired to increase the radial distance of the tool from the pivot B thepart D is disconnected from the main portion of the casing member C andthe longer screw F and a longer shaft H can then-be substituted and afilling piece inserted between the parts D and C so as to increase thedistance between the bearings for the shaft H. The manner oftransmitting power to the shaft H may also be Varied. Thus for examplesome flexible power transmitting device may be employed. The manner ofmounting the machine may be modified as for instance where it is notdesirable to in some convenient manner.

or convenient to attach the machine to the work in the manner described.The machine may be suitably fixed or mounted on a' bed plate while thework is attached there- Where the work is constituted by some piece ofmechanism which is not semi-cylindrical but comprises a portion uponwhich slotting is to be performed overan arc of a circle the machine maybe suitably mounted in relation to the work so as to bring the pivot Btruly at the center from which the curve of the work is struck.

It is to be noted that by means of this machine slotting can beperformed on ports which are positioned as are the ports Q, in closerelation to the main wall Q of the casing where it would be diflicult orimpossible I. In a slotting machine the combination of a supportingmember, a tool box pivotally suspended from this member, means for adusting and setting the tool box about its pivot relatively to thesupporting memher, a tool holder mounted so as to reciprocate in thetool box, a rotatable shaft carried by the supporting member, a crankpin on one end of this shaft which engages the tool holder and operatesto reciprocate it in the tool box as the shaft rotates, and means forimparting rotation to the shaft as set forth.

2. In a slotting machine the combination of a frame member, a supportingmember pivotally mounted on the frame member, a tool box pivotallysuspended from the supporting member, means for adjusting and settingthe tool box about its pivot relatively to the supporting member, a toolholder mounted so as to reciprocate in the tool box, a rotatable shaftcarried by the supporting member, a crank pin on one end of this shaftwhich engages the tool holder and operates to reciprocate it in the toolbox as the shaft rotates, and means for imparting rotation to the shaftas set forth.

3. In a slotting machine the combination of a supporting member, a toolbox pivotally suspended from this member, means for adjusting andsetting the tool box about its pivot relatively to the supportingmember, a tool holder mounted so as to reciprocate in the tool box. ablock formed and mounted so that it can both reciprocate and oscillatein the tool holder, a rotatable shaft carried by the supporting member,a crank pin on one end of this shaft which engages the block within thetool holder and operates to reciprocate the tool holder in the tool boxas the shaft rotates, and means for imparting rotation to the shaft asset forth.

4. In a slotting machine the combination of a frame member, a supportingmember pivotally mounted on the frame member, a tool box pivotallysuspended from the supporting member, means for adjusting and settingthe tool box about its pivot relatively to the supporting member, a toolholder mounted so as to reciprocate in the tool box, a block formed andmounted so that it can both reciprocate and oscillate in the toolholder, a rotatable shaft carried by the supporting member, a crank pinon one end of this shaft which engages the block within the tool holderand operates to reciprocate the tool holder in the tool box as the shaftrotates, and means for imparting rotation to the shaft as set forth.

5. In a slotting machine the combination of a frame member, a supportingmember pivotally mountedon the frame membery a tool box pivotallysuspended from the 81.11)? porting member, means for adjusting andsetting the tool box about its pivot relatively to thesupporting--member,: a tool holder mountedso as to reciprocate in thetool box, a rotatable shaft carried by the supporting member anddisposed radially with respect to thepivot-of this member, a crank pinon-one end of thisshaft which engages the tool holder and operates toreciprocate it in the-tool box as the shaft rotatespand means forimparting rotation to the shaft asset-forth;

6. In a slottin machine the combination of a frame mem er, a supportingmember pivotally mounted on the frame member and adjustable thereonradially'with relation to, the pivot, means for adjusting the-su rt ing,member-both angularly and radia l i y on the frame member a tool boxpivotallysuspended from the supporting member,- means for adjusting andsetting the tool box about its'pivot relatively to the'supportingmemher, a toolholder mounted so as to'reciprocate in the. tool box, arotatable shaft car riedby the supporting member, a crank pin on one endof this shaft which engages the toolholder and'operates to reciprocateit in the tool box as the shaft rotates,-and'means" for --impartingrotation to the shift as set forth."

7. Ina slotting machine the combination of a supporting member-3a toolbox pivotally suspended fromthis member, means for adjusting and settingthe'tool box about its pivotrelatively to the supporting member, a toolholder mounted so as to reciprocate in the tool box, 'a cylindricalguide in'the tool holder, a cylindrical block dispo'sedin this guide sothat it can both reciprocate and also oscillate therein, a rotatableshaft carried by the su portin member, a crank pin on oneend 0 this saftwhich engages a transverse hole in the cylindrical block and operatestoreciprocate the tool holder in the toolbox as the shaft rotates, andmeans for imparting rotation to the shaft as set-forth.

8. In a slotting machine the combination of a supporting member, a toolbox suspended bya horizontal'pivot from this mean bergmeans foradjusting'and setting the tool box about its pivot relatively to thesupporting member,-a tooltholder mounted so as to reciprocatein' thetool box, a rotatable shaft carried by the supporting'member anddisposed horizontally-"and at right angles to the pivot of the toolbdx-a crank pin on the end'of this shaft which-is adjacent to the toolbox this pin engaging thetool holder and operating to reciprocate itinlthetool box as the shaft rotates, and means for imparting rotation tothe shaft as set forth.

9.- In a slotting-machine the combination of a frame-memberadapt'edto beattached to the work operated on, a supporting memberpivotally mountedon the frame member,

atool box pivot/ally suspended from the is sha which engages the toolholder and operates to reciprccate it inthe tool box as-the'shaftrotates, a power motor mounted onthe supporting member, and gearingbetween this motor and the'crank 'shaft as set forth.

10am slotting machinethe combination of a framemember, a supportingmember I a rotatableshaft carried by the suEportin' member, a crankpinon one end of t pivotally mounted on the frame member and adjustablethereon radially with relation to the 'pivo't, means for adjusting thesup portingme'mber both angularly and radially box about its pivotrelatively to the supporting-member, a tool holder mounted soas toreciprocate in thetool box, a block formed and mounted so that it canbothreciprocate and: oscillate in the toolhdlder, a rotatable on theframe member, a tool box'pivotally" suspended from the supportingmember, meansfor adjusting and setting the tool shaft carriedbythesupporting member and disposedradially 'with"respect to the pivot ofthis mernber,-.a crank pin on one end of .this shaft which engages theblock within the tool holder and operates'to reciprocate the tool holderin the tool box as the shaft rotates, and means for impartingrotationpivotally suspended from the supporting member, means for adjusting andsetting the tool box about its pivot relatively 'to the supportingmember, a tool hdldermounted so as to reciprocate in the tool box, acylindrical 'de in the tool holder, a cylindrical block gi posed in thiside sothat it can both reciprocate and a so oscillatetherein,

a rotatable shaft carried by the su portin is sh 1:

member, a crank pin on one end of t I which engages a transverse hole inthe cylirr drical block and operates to reciprocate the l2 tool holderin the'tool box as the shaft rotates, and means for imparting rotatiiinto the shaft as set forth. 7

12.- In a slottin machine the combination of a frame mem er, asupporting member pivotally mounted on the frame member and ad]ustablethereon radially with relation to thepivot, means for adjusting thesupporting member both angularly and radially on the frame member, atool box suspended by a horizontal pivot from the.

supporting member, means for adjusting and setting the tool box aboutits pivot relatively to the supporting member, a tool holder mounted soas to reciprocate in the tool box, a block formed and mounted so that itcan both reciprocate and oscillate in the tool holder, a rotatable shaftcarried by the supporting member and disposed horizontally and at rightangles to the pivot of the tool box and also radially with respect tothe ivot of the supporting member, a crank pm on the end of this shaftwhich is adjacent to the tool box this pin engaging the block within thetool holder and operating to reciprocate the tool holder in the tool boxas the shaft rotates, and means for imparting rotation to the shaft asset forth.

13. In a slotting machine the combination of a frame member adapted tobe attached to the Work operated on, a supporting member pivotallymounted on the frame member and adjustable thereon radially withrelation to the pivot, means for adjusting the supporting member bothangularly and radially on the frame member, a tool box pivotallysuspended from the supporting member, means for adjusting and settingthe tool box about its pivot relatively to the supporting member, a toolholder mounted so as to reciprocate in the tool box, a cylindrical guidein the tool holder, a cylindrical block disposed in this guide so thatit can both reciprocate and also oscillate therein, a rotatable shaftcarried by the supporting member, a crank pin on one end of this shaftwhich engages a transverse hole in the cylindrical block and operates toreciprocate the tool holder in the tool box as the shaft rotates, apower motor mounted on the supporting member, and gearing between thismotor and the crank shaft as set forth.

In testimony whereof I have signed my name to this specification in thepresence of.

two subscribing witnesses.

ANDREW FORSTER.

Witnesses:

JOHN WILLIAM HARPER, GEORGE AsKrM MELLOR.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

